mirror of
https://github.com/f4exb/sdrangel.git
synced 2025-11-04 05:30:32 -05:00
51 lines
2.1 KiB
C++
51 lines
2.1 KiB
C++
///////////////////////////////////////////////////////////////////////////////////
|
|
// Copyright (C) 2018 F4EXB //
|
|
// written by Edouard Griffiths //
|
|
// //
|
|
// This program is free software; you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation as version 3 of the License, or //
|
|
// (at your option) any later version. //
|
|
// //
|
|
// This program is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License V3 for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
|
|
///////////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_
|
|
#define SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_
|
|
|
|
#include <stdint.h>
|
|
#include "export.h"
|
|
|
|
class SDRBASE_API AudioCompressor
|
|
{
|
|
public:
|
|
AudioCompressor();
|
|
~AudioCompressor();
|
|
void fillLUT(); //!< 4 bands
|
|
void fillLUT2(); //!< 8 bands (default)
|
|
void fillALaw(); //!< A-law compression to 8 bits
|
|
void fillULaw(); //!< u-law compression to 8 bits
|
|
int16_t compress(int16_t sample);
|
|
int8_t compress8(int16_t sample);
|
|
|
|
private:
|
|
int8_t ALaw_Encode(int16_t number);
|
|
int8_t MuLaw_Encode(int16_t number);
|
|
|
|
int16_t m_lut[32768];
|
|
static const uint16_t ALAW_MAX;
|
|
static const uint16_t MULAW_MAX;
|
|
static const uint16_t MULAW_BIAS;
|
|
|
|
};
|
|
|
|
|
|
|
|
#endif /* SDRBASE_AUDIO_AUDIOCOMPRESSOR_H_ */
|